A collection of papers on ancient and contemporary approaches to the nature and ontological status of relations. Forthcoming in 2015. Contributors: Theodore Scaltsas, Jeffrey Brower, Sydney Penner, Maureen Donnelly, Jonathan Lowe, Peter Simons, John Heil, David Yates, Nora Berenstain, James Ladyman, Sebastian Briceno, Stephen Mumford, Michael Esfeld, Mauro Dorato.